I think they're quite risky, especially if you're dealing with no collateral lending or something similar. I don't think the average joe should touch it. Even if you participate as a lender, you can still get wrecked by market conditions, terrible borrowers, etc. I agree with what has been said above, it's basically a high-risk, high-reward platform for someone with a lot of capital that can sustain the risk associated with it. If you want to grow your money by being a lender, maybe start your own lending service on this forum to build a reputation instead of locking your funds on a lending platform.